CN216919817U - Electromagnetic shielding flexible fabric - Google Patents
Electromagnetic shielding flexible fabric Download PDFInfo
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- CN216919817U CN216919817U CN202121820783.XU CN202121820783U CN216919817U CN 216919817 U CN216919817 U CN 216919817U CN 202121820783 U CN202121820783 U CN 202121820783U CN 216919817 U CN216919817 U CN 216919817U
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Abstract
The utility model relates to an electromagnetic shielding flexible fabric, which comprises a flexible fabric substrate and an organic modified layer covering the flexible fabric substrate, wherein the flexible fabric substrate and the organic modified layer jointly form a modified flexible fabric substrate, the surface roughness of the modified flexible fabric substrate is 0.7-30 mu m, and the rigidity of the modified flexible fabric substrate meets the condition that the suspended height (ram) is less than 8cm and more than 3 cm; and the organic modified layer is covered with a chemical nickel plating film. The electromagnetic shielding flexible fabric can obtain a shielding effect of more than 70dB in a range of 8.2-12.4 GHz.
Description
Technical Field
The utility model relates to the field of electromagnetic shielding, in particular to an electromagnetic shielding flexible fabric.
Background
The nickel-plated fabric has wide application, can be directly used as an electromagnetic shielding fabric to be applied to the fields of aerospace, medical treatment, electronic communication, military radar and the like, and can be used as a substrate to be continuously plated so as to realize the preparation of the multi-plated metal fabric. The thickness of the Ni, Fe and Co-based electromagnetic shielding coating prepared by the traditional brushing process can only reach millimeter level, the oxygen content is high, the uniformity is poor, and the film prepared on the traditional fabric is easy to fall off; the latest PVD vacuum coating technology has high requirements on equipment and the problem of high film growth cost, and common fabrics have the problems of intolerance to high temperature in a vacuum chamber, influence on the vacuum degree due to more fibers, and the like, are not easy to manufacture in large size, and have the problem of low adhesive force. The chemical plating has application potential due to lower cost and convenient control of the thickness of the plating layer.
In the prior art, the chemical plating process of the flexible fabric comprises 1) decontamination and deoiling treatment of a substrate, 2) coarsening treatment, 3) sensitization treatment, 4) activation treatment and 5) metallization treatment; however, as shown in fig. 1, the electromagnetic shielding fabric prepared by the prior art has poor plating quality, and has the problems of poor flatness, more pores, severe cracking of the plating, poor bonding force, uneven thickness and the like, thereby resulting in poor electromagnetic shielding effect. Therefore, an electromagnetic shielding flexible fabric with good coating quality and good electromagnetic shielding effect is needed; meanwhile, a preparation method with simple process and high production efficiency is provided; and the electromagnetic shielding flexible fabric is used for manufacturing protective articles.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing an electromagnetic shielding flexible fabric with good chemical coating quality and good electromagnetic shielding effect aiming at the current situation of the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the electromagnetic shielding flexible fabric comprises a flexible fabric substrate and is characterized in that: the flexible fabric substrate and the organic modification layer jointly form a modified flexible fabric substrate, the surface roughness of the modified flexible fabric substrate is 0.7-30 mu m, and the rigidity of the modified flexible fabric substrate meets the condition that the suspended height (ram) is less than 8cm and greater than 3 cm; and the organic modified layer is covered with a chemical nickel plating film.
Preferably, the surface roughness is 4-20 mu m, and the rigidity meets the requirement that the suspension height (ram) is less than 5 cm.
Prior art flexible fabric substrates typically have a flatness of greater than 0.5mm and a sag height (ram) of greater than 10cm, and have a flatness Ra for the purpose of modifying the flexible fabric substrate to achieve suitable roughness and stiffness1The thickness of the organic modification layer is n and satisfies Ra1＜n≤1.8Ra1. The thickness of the organic modified layer can enable the roughness and rigidity of the modified flexible fabric substrate to achieve a good chemical plating effect, and if the organic modified layer is too thin, the surface roughness of the modified flexible fabric substrate is too high, which can affect the smoothness and quality of a chemical nickel plating film, thereby affecting the electromagnetic shielding effect; the modified flexible fabric substrate is kept flat with proper rigidity in the plating process, so that the uniformity of plating solution in the plating process is ensured, and the plating quality is improved; if the organic modified layer is too thick, the rigidity is too high, and the organic modified layer is easy to crack in the processing process, so that the electromagnetic shielding effect is influenced.
Preferably, the organic modified layer is any one of thermoplastic film forming materials such as polyethylene, polypropylene, polyvinyl chloride, polystyrene and the like. Wherein, the preferred is polyvinyl chloride, and polyvinyl chloride film forming quality is good, and the rete that the plastic-coated got is difficult for breaking, and has better flexibility, and the plastic-coated technology of polyvinyl chloride is widely applied to flexible fabric base in addition, and the technology is mature.
For convenience of preparation, the organic modification layer is preferably a plastic coating layer. In addition, the organic modified layer can also be prepared by adopting a gluing process.
The flexible fabric substrate can be any one of conventional flexible fabric substrates such as canvas, nylon cloth, oxford cloth, tannin cloth, polyester cloth, viscose cloth and the like according to actual needs.
Since the organic modified layer is generally a hydrophobic surface, in order to improve the effect of electroless plating, the hydrophobic angle of the surface of the modified flexible fabric substrate is greater than 90 ° and less than 120 °. An organic modified layer satisfying this condition is selected or prepared.
In order to obtain good electromagnetic shielding effect, the thickness m of the electroless nickel plating film is 0.5-40 μm. Further preferably 1 to 10 μm.
The preparation method of the electromagnetic shielding flexible fabric comprises the following steps:
(1) preparation of modified flexible fabric substrate: preparing a modified flexible fabric substrate with the surface roughness of 0.7-20 mu m and the rigidity meeting the requirement that the suspended height (ram) is less than 5cm, and directly purchasing a commercially available product meeting the requirement or preparing the modified flexible fabric substrate by self;
(2) deoiling: putting the modified flexible fabric substrate into an organic solvent, completely immersing, ultrasonically cleaning for 25-35 min at normal temperature, then taking out the modified flexible fabric substrate, and cleaning for 3-5 min by using distilled water; the organic solvent is preferably selected from nontoxic and harmless organic solvents such as anhydrous ethanol or acetone. The absolute ethyl alcohol is further preferred, and other mixed solutions such as sodium hydroxide, sodium carbonate and the like are not selected as deoiling solutions, so that the harm of waste liquid discharge is reduced, and the safety of the production process is improved; and is more environmentally friendly than acetone.
(3) Sensitization: and (3) putting the deoiled modified flexible fabric substrate into a sensitizing solution, soaking for 4-6 min at normal temperature, and then cleaning for 3-5 min by using distilled water. Preferably, the sensitizing solution comprises SnCl215-25 g/L; the preparation process of the sensitizing solution comprises the following steps: SnCl2Dissolving in absolute ethyl alcohol, and adding small amount of concentrated HCl.
(4) And (3) activation: and (3) putting the sensitized modified flexible fabric substrate into an activating solution, soaking for 4-6 min at normal temperature, and then washing for 3-5 min with distilled water. Preferably, the activating solution contains PdCl20.3 to 0.7g/L, and 1.52.5% Vol concentrated HCl.
The sensitizing and activating steps use solutions with lower concentration, so that the cost is reduced.
Repeating the steps (3) and (4) as many times as required in order to provide enough activation sites, wherein the steps are repeated at least twice when the surface roughness of the modified flexible fabric substrate is more than 10 mu m; repeating at least three times when the surface roughness is more than 20 μm;
(5) chemical nickel plating: placing the finally activated modified flexible fabric substrate into a plating solution, and soaking for 10-35 min at 45-70 ℃, wherein the plating solution comprises the components of NiSO425-35 g/L, 15-25 g/L sodium hypophosphite and 20-30 g/L sodium citrate, and ammonia water is added in the preparation process of the plating solution to adjust the pH value to 7-10.
In addition, the utility model also provides the application of the electromagnetic shielding flexible fabric in manufacturing an electromagnetic shielding protective article. The electromagnetic shielding protective articles are personal protective articles such as clothes, aprons and gloves, and industrial protective articles such as shielding cloth and shielding covers. As shown in the figure, the shielding effect of the protective article can be more than 70dB in the range of 8.2-12.4 GHz, and the shielding effect of the protective article can be more than 75dB in the ranges of less than 8.75GHz and more than 12 GHz; the highest shielding effect can reach 80.5 dB.
Compared with the prior art, the utility model has the advantages that:
1. the electromagnetic shielding flexible fabric comprises the organic modified layer, so that a high-quality chemical nickel-plated film with good flatness, few pores, good coating integrity, good bonding force and uniform thickness can be obtained no matter the type of the flexible fabric substrate, and a shielding effect of more than 70dB can be obtained, so that various different flexible fabric substrates can be selected according to different use environment requirements;
2. the surface roughness of the modified flexible fabric substrate is 0.7-30 microns, and the rigidity meets the requirement that the suspended height (ram) is more than 3cm and less than 8 cm; the modified flexible fabric substrate within the parameter range can obtain a high-quality chemical nickel-plating layer; if the surface roughness is less than 0.7 mu m, the coating film cannot be combined with the substrate through mechanical clamping force, and if the surface roughness is more than 30 mu m, the coating film has the conditions of uneven thickness, extremely poor quality and the like; the rigidity meets the condition that the dangling height (ram) is less than 8cm, and if the rigidity is too low, the fabric is curled in the nickel plating process, so that the nickel plating concentration is uneven, and the film plating quality is influenced; the suspension height (ram) is more than 3cm, and the excessive rigidity can cause the coating to crack and drop during the bending process after the nickel plating of the fabric, thereby influencing the electromagnetic shielding effect.
3. For the organic modified layer, removing the sodium hydroxide coarsening step in the conventional process, and preventing large-area damage to the surface of the organic modified layer so as to influence the flatness of the organic modified layer; the deoiling step of the previous step adopts an organic solvent which can partially dissolve the organic modified layer, thereby properly increasing the surface roughness and improving the binding force of the subsequent chemical nickel plating film. And the coarsening step is eliminated, so that the process can be simplified and the production efficiency can be improved.
4. The electromagnetic shielding flexible fabric can obtain a shielding effect of more than 70dB in the range of 8.2-12.4 GHz, and can obtain a shielding effect of more than 75dB in the ranges of less than 8.75GHz and more than 12 GHz; the highest shielding effect can reach 80.5 dB.
Drawings
Fig. 1 is a schematic structural view of an electromagnetically shielding flexible fabric of embodiment 1 of the present invention;
FIG. 2 is a roughness profile of example 1 of the present invention;
fig. 3 is a shielding effectiveness curve of the electromagnetic shielding flexible fabric of embodiment 1 of the utility model at 8.2 to 12.4 GHz.
Description of reference numerals: 1. an electroless nickel plating film, 2, an organic modified layer, 3, and a flexible fabric substrate.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
the flexible fabric substrate used in the embodiment is canvas, the thickness is 3mm, the roughness is 0.6mm, and the suspension height (ram) of the fabric is 11cm by adopting a ring method (heart method); the organic modified layer is a polyvinyl chloride layer and is prepared by adopting a conventional plastic coating process, and the thickness n is 0.7 mm; the modified flexible fabric substrate is shown in FIG. 1 and in FIG. 2 is a roughness test range roughness profile from which a roughness of 16.65 μm and a stiffness overhang (ram) of 4cm can be obtained.
(1) Preparation of modified flexible fabric substrate: preparing a modified flexible fabric substrate with the surface roughness of 16.65 mu m and the fabric suspension height (ram) of 7 cm;
(2) deoiling: putting the modified flexible fabric substrate into an organic solvent, completely immersing, ultrasonically cleaning for 30min at normal temperature, then taking out the modified flexible fabric substrate, and cleaning for 3min by using distilled water;
(3) sensitization: soaking the deoiled modified flexible fabric substrate in sensitizing solution at room temperature for 5min, and cleaning with distilled water for 3min to obtain sensitizing solution containing SnCl220 g/L; the preparation process of the sensitizing solution comprises the following steps: SnCl2Dissolving in a drying container with absolute ethyl alcohol, and then adding a small amount of concentrated HCl for dissolving;
(4) and (3) activation: the sensitized modified flexible fabric substrate is placed into an activating solution, soaked for 5min at normal temperature, and then washed for 3min with distilled water, wherein the activating solution contains PdCl20.5g/L, and 2% Vol concentrated HCl.
This example repeats steps (3) and (4) twice
(5) Chemical nickel plating: the modified flexible fabric substrate after final activation is put into plating solution, and is soaked for 10min at 50-65 ℃, and the plating solution component is NiSO430g/L, 20g/L sodium hypophosphite and 25g/L sodium citrate, and ammonia water is added in the preparation process of the plating solution to adjust the pH value to 7-10.
The thickness of the prepared chemical nickel-plating film is about 2 mu m, and the prepared electromagnetic shielding flexible fabric has good glossiness, good smoothness, few pores, good coating integrity and uniform thickness; the surface of the organic modified layer is smooth; the nickel plating layer is flat, compact and uniform, and the plating layer is not stripped, which indicates that the plating layer and the modified flexible fabric substrate have good bonding performance.
As shown in FIG. 3, the shielding effect of more than 70dB can be obtained in the range of 8.2-12.4 GHz, and the shielding effect of more than 75dB can be obtained in the ranges of less than 8.75GHz and more than 12 GHz; the highest shielding effect can reach 80.5 dB.
Example 2
The flexible fabric substrate of the embodiment is canvas, the organic modified layer is a polyvinyl chloride layer, and the canvas is prepared by adopting a conventional plastic coating process, wherein the surface roughness of the modified flexible fabric substrate is 6.07 mu m, and the fabric overhang height (ram) is 5 cm.
(1) Preparation of modified flexible fabric substrate: preparing a modified flexible fabric substrate with the surface roughness of 6.07 mu m and the fabric suspension height (ram) of 6 cm;
(2) deoiling: putting the modified flexible fabric substrate into an organic solvent, completely immersing, ultrasonically cleaning for 28min at normal temperature, then taking out the modified flexible fabric substrate, and cleaning for 4min by using distilled water;
(3) sensitization: placing the deoiled modified flexible fabric substrate into a sensitizing solution, soaking at normal temperature for 4min, and cleaning with distilled water for 3min to obtain a sensitizing solution containing SnCl215 g/L; the preparation process of the sensitizing solution comprises the following steps: SnCl2Dissolving in a drying container with absolute ethyl alcohol, and then adding a small amount of concentrated HCl for dissolving;
(4) and (3) activation: placing the sensitized modified flexible fabric substrate into an activating solution, soaking for 4min at normal temperature, and then cleaning for 3min with distilled water, wherein the activating solution comprises PdCl20.3g/L, and 1.5% Vol concentrated HCl.
In this embodiment, the steps (3) and (4) are performed only once
(5) Chemical nickel plating: placing the finally activated modified flexible fabric substrate into a plating solution, and soaking for 30min at 50-65 ℃, wherein the component of the plating solution is NiSO430g/L, 20g/L sodium hypophosphite and 25g/L sodium citrate, and ammonia water is added in the preparation process of the plating solution to adjust the pH value to 7-10.
The thickness of the nickel plating layer prepared in this example was about 40 μm.
The quality of the electromagnetic shielding flexible fabric prepared by the embodiment is similar to that of the embodiment 1, the quality of the nickel coating is good, and the binding force between the nickel coating and the surface of the organic modified layer is good; the shielding effect of more than 70dB can be obtained within the range of 8.2-12.4 GHz.
Example 3
The flexible fabric substrate of the embodiment is canvas, the organic modified layer is a polyvinyl chloride layer, and the canvas is prepared by adopting a conventional plastic coating process, wherein the surface roughness of the modified flexible fabric substrate is 6.37 mu m, and the fabric overhang height (ram) is 6 cm.
(1) Preparation of modified flexible fabric substrate: preparing a modified flexible fabric substrate with the surface roughness of 6.37 mu m and the fabric suspension height (ram) of 6 cm;
(2) deoiling: putting the modified flexible fabric substrate into an organic solvent, completely immersing, ultrasonically cleaning for 35min at normal temperature, then taking out the modified flexible fabric substrate, and cleaning for 3min by using distilled water;
(3) sensitization: soaking the deoiled modified flexible fabric substrate in sensitizing solution at normal temperature for 6min, and cleaning with distilled water for 3min to obtain sensitizing solution containing SnCl225 g/L; the preparation process of the sensitizing solution comprises the following steps: SnCl2Dissolving the mixture in absolute ethyl alcohol in a drying container, and then adding a small amount of concentrated HCl for dissolving;
(4) and (3) activation: the sensitized modified flexible fabric substrate is placed into an activating solution, soaked for 6min at normal temperature, and then washed for 3min with distilled water, wherein the activating solution is PdCl20.7g/L, and 2.5% Vol conc HCl.
In this embodiment, the steps (3) and (4) are performed only once
(5) Chemical nickel plating: the modified flexible fabric substrate after final activation is put into plating solution, and is soaked for 20min at the temperature of 45-60 ℃, and the plating solution component is NiSO435g/L, 25g/L sodium hypophosphite and 30g/L sodium citrate, and ammonia water is added in the preparation process of the plating solution to adjust the PH value to 9-10.
The thickness of the nickel plating layer prepared in this example was about 23 μm.
The quality of the electromagnetic shielding flexible fabric prepared by the embodiment is similar to that of the embodiment 1, the quality of the nickel coating is good, and the binding force between the nickel coating and the surface of the organic modified layer is good; the shielding effect of more than 70dB can be obtained within the range of 8.2-12.4 GHz.
The technical means disclosed in the utility model scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (6)
1. An electromagnetically shielding flexible fabric comprising a flexible fabric substrate, characterized in that: the flexible fabric substrate and the organic modification layer jointly form a modified flexible fabric substrate, the surface roughness of the modified flexible fabric substrate is 0.7-30 mu m, and the rigidity of the modified flexible fabric substrate meets the condition that the suspended height is less than 8cm and more than 3 cm; and the organic modified layer is covered with a chemical nickel plating film.
2. An electromagnetically shielding flexible fabric as claimed in claim 1, wherein: the flexible fabric substrate has a flatness of Ra1The thickness of the organic modification layer is n and satisfies Ra1＜n≤1.8Ra1。
3. The electromagnetically shielding flexible fabric of claim 2, wherein: the organic modified layer is any one of polyethylene, polypropylene, polyvinyl chloride and polystyrene thermoplastic film forming materials.
4. The electromagnetically shielding flexible fabric of claim 2, wherein: the organic modified layer is a plastic coating layer.
5. The electromagnetically shielding flexible fabric of claim 1, wherein: the thickness m of the chemical nickel plating film is 0.5-40 μm.
6. An electromagnetically shielding flexible fabric as claimed in any one of claims 1 to 5, wherein: the hydrophobic angle of the surface of the modified flexible fabric substrate is greater than 90 degrees and less than 120 degrees.
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| CN202121820783.XU CN216919817U (en) | 2021-08-05 | 2021-08-05 | Electromagnetic shielding flexible fabric |
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| CN113463381A (en) * | 2021-08-05 | 2021-10-01 | 北京航空航天大学宁波创新研究院 | Electromagnetic shielding flexible fabric and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113463381A (en) * | 2021-08-05 | 2021-10-01 | 北京航空航天大学宁波创新研究院 | Electromagnetic shielding flexible fabric and preparation method and application thereof |
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